Valve



E F. MEKELBURG IL VALVE Dec. 18, i956 Filed March 10. 1951 4 Sheets-Sheet l IN VEN T0125` De@ 18, 1956 E. F. MEKr-:LBURG TAL 2,774,373

VALVE 4 Sheets-Sheet 2 Filed March 10, 1951 Hwa/d. m S W 7/ W 16W Dea, ES, i956 E. F. MEKELBURG ETAL 2,774,378

' VALVE Filed Harsh 10. 1951 4 Sheets-Sheet 5 Dec 18, 1956 E. F. MEkELBuRG ETA. 2,774,378

VALVE Filed March 1o.. 1951 4 sheets-sheet 4 United States Patent 2,774,378 VALVE Earl F. Mekelburg, Wauwatosa, and Carl B. Sohns, Milwaukee, Wis., assignors to Square D Company, Detroit, Mich., a corporation of Michigan Application March 10, 1951, Serial No. 214,962 13 Claims. (Cl. 137-623) This invention relates .to electrically operated valves for controlling pressurized uid flow and, more specifically, to an electrically operated Valve of the type employed in a system where uid under pressure is utilized to do work.

Still more specifically, this invention relates to a valve for controlling the entrance of air under pressure into, and .the exit of air from, a reciprocable piston in which the position of the valve is responsive to the energization of an` A further object is the provision of a valve controlled-rl by an electromagnetic device in which a variable relationship between the valve operating lever and a lever moved by the armature of an electromagnet is employed, whereby. the closing shock imparted to the electromagnet is minimized.

'Another object of the invention is the provision of anovel electrically operated air Valve in which the change from one stable operating position to another is rapidly effected.

Another object of the invention is the provision of an electrically operated valve which will operate in any mounted position without being adversely affected by gravitational pull.

Other objects and features of the invention will beV` readily apparent to those skilled in the art from the speci` cation and appended drawings illustrating certain pref-Y erred embodiments in which: y n Y Figure 1 shows a top plan view of the structure of the present invention with part of the cover broken away to show internal parts.

' Figure 2 is a sectional View along the liners H -l- Il .of

Figure l.

- Figure 3 is a sectional view along Vthe lines III--III of,

Figure l.

Figure 4 is a sectional view along the line IV-IV of Figure 1.

Figure 5 is a sectional View also along the lines IV-IV of Figure l, in whichthe rotor has been moved about'45 degrees from .theposition illustrated in Figure 4.

AFigure' is a detailed Figure 4.

Figure l with part of the rotor broken away. g

Figure v8 is an exploded view ofone form of rotor for the present invention and its cooperating parts.

Figure 7 is a detailed view along the linesjVlI'fYIl of Figure'9'iswa detailed viewfalongjthe lines of Figure 4,

Fi'gure l0 an explodedV view of'jcomplementarypartsjm Figure l1 is a diagrammaticrepresentation of the de of thevalve body.

Y communication with the annular passages 24 and 25,'4 re`' spectively, of end plate 21. In addition, portion 9 is fur-V ther apertured at 77 and 78 to connect channels 15 and"- view along the lines VI-V of.`

2,174,378 Patented Dec. 1,8,

ICC

vice of the present invention in an operative connection;`

Figure 1 is an exploded view of a second type of` rotor for use in the present invention. 1

The device of the present invention comprises an outer metallic cover 1 which is mounted upon a base 2 oa material such as cast iron, the base being provided with suitable holes 4for the mounting the cover 1, and having in addition four threaded orifices 3, 4, 5 and 6, as Ashown in Figure 4. Mounted upon the base 2 by bolts 12 is a two piece valve body 7 comprised of two identical, ycontiplementary portions 8 and 9 forming channels 13, 14, -15 and 16, the halves of these channels formed by portion 8- being shown in Figure 5. One end of each of these channels directly communicates with one of -the threaded ori-q tices 3, 4, 5 and 6, sealing rings 11 being provided at the. connection between the valve body and the base. These' channels, at their interiorends,`communicate with a central passage which is morefully described later.

Mounted to the back of portion 8 of the valve body 7` is an en d plate 18,Y a sealing gasket 17 being interposed' therebetween, a second gasket 19 and end plate 21YserveY to sealably close the back of the portion 9 of the valveY body 7, these elements being xedly held together byV means of the bolt and nut fasteners 26. The end plates 18 and V21 are identical and have two concentric, annular passages separated by a solid circular wall, the passages of end plate 18 being numbered 22 and 23, while those of;

end plate 21 are numbered 24 and 25. Y -Y The complementary portions 8 and 9 of the two piece valve body 7 together form four chambers 29, 31, 32 and 33 whose interior ends communicate with the central passage, those halves of these chambers formed by portion t8V being shown in Figure 5. In the portion 8, the end Vof chambers 32 and 33 are aperture at 71 and 72 respectivfee4 ly't'o elect communication of concentric passages22` and 23, respectively, of end plate'18 with these openend'- chambers, as shown in Figure l0. Portion 8 is lalso apertured at 73 to connect channel 13 with passage 2 3 at 74 to connect channel 14 with passage 22.

In the portion 9of the valve body 7, the outer 'ends ofv chambers 29 and'31 are apertured at 75 and 76 toeiect 16 with passages 24 and 25 respectively.

The complementary portions `8 and 9, which together formtheV chambers 29, 31,' 32 and 33, and the channels 'Y 13, 14, 15 and 16 are so arranged, as will be seen from an inspection of Figure 10, that each chamber and each ofthe other end plate.

Extending through the`valve body portions 8 and 9and central hubs integral therewith is a cylindrical opening-in which is' rotatably disposed a rotor 37 having. thereinf four slots 38 which extend axially along the rotor for a portion of its length. VIn each of'these slots 38 there is enclosed a light spring member 39 which acts to bias aVY sealing vane 41o`utwardly against the interior surface ofl -the Vcylindrical opening. In Figure 8 there is shown an exploded View of the rotor and the aforementionedparts'i which cooperate with it. The surface of rotor 37 isproi vided With-four concave cavities'44 which eX-tend over'a portionofthe length 'of the-rotor 37, these cavitiesr44 bridging the entrance to two of the adjacent chambers'and channels formedby theportions of the valve body when 'the rotor 37 is in either of its two operating'positions,"

those shown in Figures '4 andV 5. It shouldbe noted'thatVV the sealingvanes 41 isolate the cavities .44 one .from the other by pressing against the' interior surface of the cylin *I drical opening. v f 1 position 'shown in Figure 3.

Y In yFigure Y1 2 there is illustrated a modied rotor atssembly which when assembled operates in the same manner as rotor 37. This rotor is formed of several pieces to vfacilitate manufacture and with close tolerancesfthe vanas 41 may be omitted.

One end of rotor 37 hasa slot itlfiritoV which a keying extension ofla lever 45j is mounted by a' shouldered screw 16. Mountedfabout an'extension ofthe screw 461there;

is `astrongcoil'rspring Vi 7,rone end of which is broughtV out to; a biasvv adjustment Vbracketjtihaving a series, of V1() liolesjinY which thisxend of the springrnay be positioned t9 vary thefprce which the springexerts.A VThe Vother end ofcoil; spring 47 acts'uponan undersurface oflever 45,

4,5as itfrnoves'dn `cou`nter-cloclo`zvise direction from the MountedY so as to act upon the uppersurface of lever 45 is a roller 52, the roller being rotatably mounted upon ythe'longer"arm ofva general 1y U shaped member 53 'which is pivtally mountedupon extending ears'54 of the bracket Y 5,5.v YThe bracket 55 is-rigidly mounted, asV by studs, *toV a 25 Yt-wopiece metallic frame 56,VV the frame itself being secured b'yfstuds to the base V2. Carried by the framef56is a, generally EV shaped magnetic Ycore 57 vupon vwhich. is1` mounted an energizing coil 58 having terminals Vtii'rfor the connection of 'conductor's. Pivotallyrmounted-toand 30 rbetween the arms ofthe generally Ushaped member Vis a magnetic T shaped armature 59 which is attractedto Y Y Ithe Ej shaped core upon energizationrof coil 58. Y Asec-V 'l ondbracket 61, also supported by frameV 56, is providedY witha rubber abutment 62v whichacts tolimit the amount 35 o f-vnrovernent'of the4 T shapedarmature 59 awayV from the core 57.- f

The operation of the device of the presentrirnvention may be illustrated by-describing its use in conjunctionwithYV aconventional double actingV piston as shown in vFigure 40 Y 1,1.v Thatportionf of the' cylinder tothe left of the'pist'on Y head is designated as cylinder 100, while thev portion of Y the cylinder totheright ofrthepiston head Ais designated asV cylinderZtO; f It'shouldbe noted, V4initially, 'that 'the' mounting position ofthe'devicelofthe present` invention 45 Yisfof noimportance', this. device being readily'rnountable {asconditions dictate, the operationlof therdevic'e in" no way beingadviersely vafteetectby th'eforce of gravity. f. Y -V'Asvshown'in Figure ll; to the threaded oric'e 3 there,Y

isgconnejctedgpiping carrying air-:under pressure Yfrom-the V50,r

supply; through conventional:tren` eilen andVV regulatorV mechanisms; the threaded orifice 4 is connected tocylinder 190;fthe -threadedgoritice'r to an exhaust pipe; arid-the ThegT/ shaped armature. Y59 is thereby 4,moved away yfroni l the cor-@57 adistance whichjis deterrninedby thVabut-f i V mentflofbraclet 61. YInjthis positionofthefoperatingVrr Y part s,rthe leverr45 has moyedvrotorf37 to position 65.

The "spring biasedY sealing YYanes fpreyentilateral Vla' othilsparfto adjacent chan'nelsifAir' fr 1 under pressure"williv then passV froni'g-thlefsouree Y through the Vthreadediorilifcelv andf into channel'gl'; YA'r 1 Y Y Awill V'piss through ...the associated"A cavity Yin'iro'torw 3 7 Vint channel 14 andlthence Ythrough orifice 4 to cylinderilll if f Y 2,774,378

Y effected? Y 1 also pass fthrougli'fthe aperture'in the valve ody portion Sinto lthe passage-Zilofl end plateflS;q-'lfhisl enters chamf Y n Y Y Y v .tto extranet;` one through.. ai rotort cavityto j channehj 15 ber VElthrough the. aperture Ytherein,` and through that andeih'astjtheother through passage v2 2, YVchar'nberjlvi,

V chamber toimpinge upon the surface of the.rotcxcavityV Yture of that chamber into the annular passageZZ ofV end plate 18 whence it also hows into channel i4 and thence to cylinder 100. It should benoted that air from the supplyunder pressure, impinges uponV the rotor member 375;

Yon surfaces which are diametrically opposed, theY result being that the pressures enerted Yagainst the rotor are bali-Y anced and side thrust upon the rotor is minimized.

' As air,underpressureenterscylinder Ylfm, the piston'VY aforementioned will, of course, move to force the airi Y tfwhich exists vin cylinder yZtl@ out through thepiping which Y c'onnects'it to orifice 6. This air will proceedfthrough the channel Y16 and a part of it WillV go through the aperture therein, this aperture being in'portion of valve body 7 into the annular passage 25 of end plate 21. It will then flowthrough passage 25into chamber-29 through the VYaperture therein. .This airfwill then enter VYchamber 31' 2O after'passing through the adjacent rotor cavity, andethen Y into the annular passage 24 of end plate Z'whic'h will carry the air to channel'l and thence through orifice 5 to exhaust. Meanwhile, another portion of this airfrm cylinder 2G() will pass ,directly from channel 1.6 to'chan-V nellS and to exhaust. lIt will be noted that the air from cylinder i260 also strikes the rotor memberiat two di-` ametrically opposed points to-balance the air pressure against the rotor in order to avoid'side thrust thereon.V

IOn energization of the coil 5S, the control yofwhich maybe located at any'distancefrom the unitdescribed,`VYV the T shapedlarmatu're'SQ is attracted toward the core 5K7.v As'armature ,59, moves downward Vfrom the position shown inFigure'Z, the U shaped member 52yisrrnoved 'Y countercloclwise about its pivot upon the ears 54 of bracket 55. VThe roller 52'is,Y thereby Vmoved downwarda'longthe surface of lever 45,' this levier being forced ft'o Vrotate'againstthe bias v of the spring 47; RotorY 37fisY rotated'asV leyerf45 moves, this rotation'of ther'otor being electe'dby means ot'cooperatio'n betweenwthe'keying,ex- Y' vtension of Vlever 45 Yand the keyin'gslot 40 in the rotor YAs the roll"er' 52r is moved downward, the distance be tween the center'of Vrotauonfof the'lev'erV and the 'point at which pressure Vis applied to the lever through thermediurn of roller 52 is constantlyldecreased.A Thisfactio'n results in afconstantly decreasing mechanicalY advantage'which has two adyantageus'eiects. In the rst place, the power f 'Y ayailable from the energized electromagnetis fullyruti lined, thuvs permitting theV employment of a minimum size 'electromagnet opcrating`;.vi tha small powerr'requirement; l 'Y Secondly, tzhisflarran'gement provides that nthe forcegof` 1 i springr47 more strongly "opposes-fthe movementofarmature'Sftowardfcrer'l V'aslthe armatureV closes upon the Y 'Y i core, thus'tendingtofminirniiethelshocle associated with' magnet'closing,= and the life, ofthe mechanismfis Vthereby f' materiallyincreased-f Y' A' y Withlthe armature fully in contact fwiththefcore, l'thel Y' 4"rotor Y3?7 Vin the position illustrated ini FigureV 5'. 1TH? comparisono'fti'guraj withvsFigur/ejtfwill indicate that the rotor'ha's been rotated'only aboutit/5, YYandmit is-v ob-1Y t l vious that'thissniallfpositional change can- Vbe'lrgraliidly' V` 'In' thisV posltion, have W50- baisthrough passage 213,

meer 29 into as saoe lA'Ys'tlieair nter cylindervZtl thereciprocfabl piston i '2a-rasta 'rotor cavitycham ber 31, passage24 to channel 15 and exhaust inA channelY 14 passesy through 'the Aorilicei thereinand into Yannular passage 22 of end plate 18, from Vwhich it proceeds through the open end of chamber 32 into that chamber; then it strikes against the rotor to enter chamber 31. It proceeds through the open end of 'chamber 31 into passage 24 of end plate 21, through which it passes through the opening in channel 15, and 'out to the exhaust through threaded orifice 5. It should be noted again that air under pressure strikes all four of the surfaces ofV cavities 44 of the rotor` 37, side thrust ofthe rotor being substantially eliminated by the balanced application of pressure. Y

As the coil 58 is deenergized, the operating parts will return, under the bias of spring 47, to the position illustrated in Figures 2 and 4. As spring 47 exerts a sub- Y stantial bias, this movement is rapidly accomplished, the

T shaped armature 59 moving away from the core 57 until it strikes against the rubber abutment 62 which limits its upward movement.

It will be seen that in all cases air being exhausted from the operating cylinders passes through the valve body of the device of the present invention before being carried away by external piping. By this arrangement, the eX- haust air cools the valve body and minimizes any tendency of the parts to seize. It should further be noted that the device of the present invention employs a rotor which is very small in diameter, the rotor needing to be only large enough to provide cavities which bridge adjacent entrances. By thus employing a rotor of very small diameter, the power required to effect movement thereof is minimized. The advantage of utilizing a device having a very small diameter rotor will be better appreciated when it is pointed out that the turning torque required is proportional to the square of the diameter of the turning member.

It is clear, therefore, that the device of the present invention is a greatly improved electrically operated valve which is capable of being mounted in any position without adverse operating eect. This device directly controls the flow of air, or other medium under pressure, yet operates with a power requirement no more than that of a pilot operated device. Further, this device is so constructed that only a few moving parts are employed, and these are quite small so'that the cost of the device is minimized, yet the operating life of the mechanismis greatly extended over that for older similar devices. Still further, this device while being easily adjustable and readily removable for cleaning, is of a very small overall size. device of this invention operates with extreme rapidity,

thus permitting close electrical timing between the device and associated system elements.

While certain preferred embodiments of the invention have been specically disclosed, it is understood that the invention is not limited thereto, as many variations will be readily apparent to those skilled in the art and the invention is to be given its broadest possible interpretation within the terms of the following claims:

What is claimed is:

l. Inran electrically operated device for controlling the flow of pressurized fluid, a valve body having a plurality of passages therein through which said uid passes, means within said valve body Vfor directing the tlow of fluid through said passages, means biasing said directing means. toward "one position, and electromagnetic means including an armatureV and. core for controlling the position of said directing means, said armature having a connection to said directing means which decreases in mechanical advantage as said armature approaches said core whereby the shock associated with closing of said armature uponsaid core is minimized.

2. In an electrically operated device for controlling the flow of pressurized duid, a valvel body having a plurality of passages therein through which said uid As a further advantage, it will be seen that the passes, meanswithin said valve body for, direCtingi-he owof iluid through said passages, means for adjustably positioning gsaid directing means to achieve a desired flow path for said iiuid through said valve body including means biasing said'directing meansV toward one position and a lever connected to said directing meansl forfopei'at-y ing said directing means to another position.e1ectro magnetic means including a coil, a core, and an armature attracted to said core upon energization of said coil, and means connecting said lever to said armature, said lever having a connection to said directing means which decreases in mechanical advantage as said armatureis attracted to said core whereby the shock' associated with theclosing of said armature upon said core is minimized.

3. In an electrically 'operated device for controlling the flow of pressurized fluid, a valve body havin'g'aY plurality of passages therein through which lsaid fluid passes, a rotor within said valve body, rotatable means for adjustably positioning said rotor, a leverhaviug one portion thereof movably positioned upon said last men tioned means, a spring biasing said lever toward one position, an electromagnetic coil, a core, and an armature movable toward said core upon energization of said coil, and means connecting said lever to said armature whereby said lever moves upon attraction of said armature, the end of said lever positioned on said last mentioned means being moved toward the center of rotation of said last mentioned means as said armature approaches said core whereby the closing shock associated with the closing of said armature upon said core is minimized.

4. In an electrically operated device for controlling4 the dow of pressurized fluid, a valve body having a plurality of passages therein through which said uid passes, a rotor within the said valve body, rotatabley means for adjustably positioning said rotor, a lever hav` ing a roller thereon which is movably positioned uponsaid last mentioned means, a spring biasing said lever toward one position, an electromagnetic coil, a core, and an armature movable toward said core upon energization of said coil, and means connecting said lever to' said armature whereby said lever moves upon attraction of said armature, said roller being movedV toward the center of rotationof said last mentioned means as said arma,-` ture approaches said core whereby the shock associated with the closing of said armature upon said core s minimized. v

5. In an electrically operated device for controllingl the iiow of pressurized uid; electromagnetic means in' cluding an armature, a core, and an energizing` coil, a valve body having a plurality of separate chambersy with entrances thereto defining a central aperture extending laterally through said valve body, a pair of end plateseach adjacent one side of said valve body and having. separate passages therein, openings in said chambers'. registering with `said passages for communicating said` pass'agesrwith said'chambers, means within said aperture for controlling the'ow of uid owthrough said valve body and end plates, rotatable means for adjustably posiY tioning said controlling means to achieve a desired ilow..V

path lfor saidrfluid through said valve body, means biasing l saidlast mentioned means toward oneV position, a lever connected to Vsaid last mentionedmeans* for operating said larst'mentionedY means,.and'mean's connecting said; lever to said armature, said lever having a connection to said last mentioned means whichY decreases in mechanicalf advantage as said armature is attracted by said coil wherel by the shock associated with the closing of said armature l P011 said core isminimized. y 'if 6. In an electrically operated device for. controlling.1 the owyof pressurized fluid, a valve body having a. pluffV rality of distinct 'channels and chambers therein, means for'communicating certain of said valve bodylchannelsf,

to a source of pressurized uidandothers Vto a liuid opg'A erative device, -each of-A said' channels and chambers,A

havingvaneentrance, said'entrance deiiningqa central",l

Y Y irrigare aperture ,extending'laterally' through Ysaid valve f'body, VSaid valve body being soV Constructed and arrangedthat Saidf'channels and chambers are circumferentially spaced aboutsaid aperture, nieans'for selectively interconnect-V .i by lsaid fluidfupon saidjrotor-are Asubstantially balanced, andgopeningsfin said. channels Y*and chambers for register- Y ing with said'pass'ages Yfor 'permitting huid triowY between said channels andchamberis andfsaid passages.,

l0. In an electricall V: operated device for controlling Y inglcertain of said channel and chamber entrances for Vdirecting uid flow therebetween, each of said'channels. the Aflow of pressurized iluid, a V valve bodyhaving `a Vbeing disposed lat the opposite side of Vsaid directing e plurality/.of distinct channels and chambers therein, means means from'one of said chambers,means providinguid for connecting'certain of said valve body channels to' va 'flow between opposingA channels and chambers whereby Y source of pressurized uid and others to 'a flud'operativc the forces exerted by said fluid upon Ysaid directing means '10 ViC'S, 636k f 'Said Channelslfandi Chambers' having a?" Y fe balnced,'said means providing uid ow 'mprisjng entrance thereto centrally disposed lwithin said valvebody` opposite' side plates mounted on said valve bodyaand Wiih Saidflllce .deDDgf'fcular aperture which having separate passages therein isolated from each other, eXtelldS. late fany through. Said IT/11V@ b O'ffYs-S'eid YYC body Y s idvalve body having Openings therein for` permitting being Asoc'on-st'ru'cted and :arranged thatsaid channels andi l uid flow between said channels and chambers through 15 Chambers 2T@ cifcumfefentiauypced about Said circular said passages'. Y i Y Y aperture, a rotor within' said aperture having at least two 4 Y7. In'an electrically operated device rer'conaoiiing 'the Pair 0f arcuate smfaccpo'rtions theron'eahtcr bridging aow of pre'ssjuriz'edziinid, a valve bodyy having a plurality' only adjacent entrances t0 direct tud OW therebetween 1 of distinct channels and' chambers therein, means forV each @f Sad .afuate Surfaces 011 Sal@ TU OT being, @ITCCY 'l connecting certain of saidV valve' body channels to a 20 OPPOSS a Slmll arcuate rotor Suffaier eachfof s ald source of pressurized uid, and others to a'ui'd operated Channels bang flSPGSed ai the QPPQSIC S11e- 0f salf IOOI Y device, each of said channels andV chambers having an Y from one 0f SUd Chambers means lPmVldmg mud OW- entrance, said entrance defining a central vaperture ex- Y between Opposing C hamfjls and chmper? Wherby the 1 tending laterally through said valve body, said Vvalve forces exert?? bY-Sald fluid QH sa@ dlfectmg me'n .ae-

body being so constructed and arranged that said channels b alani Sal@ Vmans Provldmg uld QW COmPnmg' a and-chambers are'circumferentially spacedabout said P21 O 091305.15 51de Plate? each mounted to on? 51d@ f aperture, means for' selectively 'interconnecting'V certainA of aldmlve body and hal/19g Separata pqssgs the-rem sa'id f' channel and chamber entrances for directing fluid lsolaed frqmejwh oher s ald Valve body having penmgs.- how therebetween, each of said channels being disposed Y thm registering with said passagsfor Permitting ul'd tule Opposite Sid-e of Said directing means from one 30 flowV between -said'channels andichambersgthrougn said of said chambers, 'means providing huid how between op- Passages Y` posing channels Yand Vc'zh'arnbers whereby the forces exerted 1 1 m alelecmaily Operated def/ice for Contrlhng by s'aid'iluid upon saidl directing means are balanced, said the w or Pliessurrzd uld a Vratvs bdy having 'a means providing i'iuid flow Vcomprising opposite side plates z plurality 'of .dlstmct Channels .and 'chambers theremmeans; .mounted on Said Valve bodynd having* pluralityY of forrconnecting certain of said valve body channels@ a separate passages; therein isolated from each other, 'saidv Souls? of pressunzd uidand Otherst-Qa amd Opmlv j g valve' bodyhaving opening'stherein for permitting fluid. 'devlce each 0f Said chamiels .andrhgmbefs h avmg an ow between said channels and chambers through' said erftrance.'theretoentrauy fhsposd. wlthm slald valvebqdy. passa'gegy Y i Y Y 'with said entrances defining afcircular aperture which 8.' InV an electrically operated device for controlling the. 10 exends laterally through' said Valve body .Sad valYel bod How offpressurized fliiid, a valve body having a plurality being so constrilctd and arangd't'hat Sald chzinne. 5 an of'distinct channels and chambers therein, means for Chambers are clrungerfemlauySpad'aPout .Saldclfular connecting certain of said valve'body channels to a sourceV apertilre a' rpm? wlthm s-ald tape-dure hayuig- 'sum lf of pressurized fluid and others to Va Yi'luid'operative device; geeutlhlrtlgGg/hadgcgaenllfgctb11g; ihegffisci;IDiunaii 4?! directly @time @me ffotofeaifface @39h 0f-Sala; f ly through saidfvalve body, said valve'body being socon- Y hannelpefmgglsoseg at the OpposltidegI-.ad rgmfal1-.e "-Cfcumfereniuy .space dzfabi sadlcntlal aperture forces 'exrerted by'said fliiid upon said rotor a're'balanced," Y rneansrfor selectively interconnecting certain of said chan- V said means .pmviding uid w `Comprising a pirofY *niemand cymbrers for ,irtng uid ow therebtwen opposite' side' plates veacl'mount'ed to one'side of said' 'ehgf sfud Shag-nels bemg disposed atkthe loppqslte 51de valve body and having passages lt-l'ierein isolated from'each.

" of-.svald'dleup in n fr?? onf Siald limbelst 'and Y' other, said valvebodyhaving opwings-therein registering 'g1 i means Proyldmg. mdow; between.. OpposmgcilamJ-eis with said passages fory permitting fiu'id'tio'w betweensaid and hambers Whby the .forges -Xrttedzby'sfdld .uld 575 channelsV and chambers' through said'passages.k i upon Said dretmmeanar balm-cgil" t Y s Y `12. The device'detihed in claim 1l lin Vwhich rr'iean'sea'i'.:

'l n ekmcauy Operated dem@ fPr 'Controlhllg vprovided'onsaid'rotorfori preventing direct fluid flow-'. L Y WOffAP-rssunzed'uld a Valve bpdyfhavmg ,a Plurahtyf between adjacent rotor surfaces: f 'f `V Owf. ,gisting i channels-and chambrs theeinrfgeans Y ifo- 13.' The device defined i'nclairnV il in which means are t 'gfnlecing Certanrofaid*Yalvbdy Channlsfto a. suf' 60' providedxonVY saidv rotor for preventing direct iluidhow Q fpress'uri'ze'd vfliiid 'arid'others to auid 'operative/device,"

y betweenV adjacent rotor suraces, and -ingwhichfsaid side;v ah. Oftsaldhamielsand 'Chambers hal/mg .an @nuancer plate passages are uconcentric with'. said valve bod .l aper- 

